Loudspeakers

a loudspeaker and wave panel technology, applied in the direction of transducer diaphragms, electromechanical transducers, diaphragm construction, etc., can solve the problems of only ever increasing the diameter slightly, premature roll-off, and power handling and excursion problems, and achieve the effect of improving off-axis power
US6839444B2Inactive Publication Date: 2005-01-04NEW TRANSDUCERS LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NEW TRANSDUCERS LTD
Publication Date
2005-01-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

A loudspeaker comprising a panel-form acoustic member adapted for operation as a bending wave radiator and an electrodynamic moving coil transducer having a voice coil mounted to the acoustic member to excite bending wave vibration in the acoustic member. The junction between the voice coil and the acoustic member is of sufficient length in relation to the size of the acoustic member to represent a line drive such that the acoustic member has a mechanical impedance which has a rising trend with bending wave frequency.
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Description

TECHNICAL FIELDThe invention relates to bending wave panel loudspeakers, e.g. resonant bending wave panel speakers of the kind exemplified by WO97 / 09842, and to drive motors for such speakers.BACKGROUND ARTIn making electro-dynamic, that is moving coil, vibration transducers for bending wave panel speakers, current thinking on voice coil size and mass tends towards the use of small diameter and low mass voice coil systems, typically of the size of tweeter coils of conventional pistonic speakers. In certain applications, e.g. for driving bending wave panels or diaphragms as exemplified by WO98 / 39947, which are intended to be driven centrally, e.g. so that they can act both pistonically and in bending, such small diameter voice coils may cause power handling and excursion-related problems.For such small diameter voice coils the drive point impedance (Zm) approximates to that of a panel driven at a single point. As the frequency is increased Zm oscillates with modal structure but is on...

Claims

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